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在区间（0，1）上随机取两个数m，n，则关于x的一元二次方程x2﹣•x+m＝0有实根的概率为 ．
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高一下学期数学《》真题及答案
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在区间01上随机取两个数mn求关于x的一元二次方程x2－x＋m＝0有实根的概率.
若关于x的一元二次方程x2﹣m+3x+3m=0的两个实数根分别为﹣1和n则n=__________.
在区间01上随机取两个数mn求关于x的一元二次方程x2－x＋m＝0有实根的概率.
已知mn是关于x的一元二次方程x2﹣2x﹣1=0的两个实数根则代数式3m2﹣n2﹣8m+1的值等于.
关于x的一元二次方程x2+3x+m﹣1=0有两个实数根求m的取值范围.
关于x的一元二次方程x2＋2mx＋2n＝0有两个整数根且乘积为正关于y的一元二次方程y2＋2ny＋2
下列关于一元二次方程的四种说法你认为正确的是
方程2y
2
－y＋
＝0必有实数根
方程x
2
＋x＋1＝0的两个实数根之积为－1
以－1、2两数为根的一元二次方程可记为x
2
＋x－2＝0
一元二次方程2x
2
＋4x＋3m＝0的两实数根的平方和为7，则m＝－1
已知mn是关于x的一元二次方程x2﹣3x+a=0的两个解若m﹣1n﹣1=﹣6则a的值为
﹣10
4
﹣4
10
已知关于x的一元二次方程x2＋bx＋c＝0.从－123三个数中任取一个数作为方程中b的值.再从剩下的
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从-2-1012这五个数中任取一个数作为关于x的一元二次方程x2-x+k=0中的k值则所得的方程中有
关于x的一元二次方程kx2﹣x+1=0有两个不相等的实数根则k的取围.
已知关于x的一元二次方程x2+mx+n+1=0的一根为2.1求n关于m的关系式2试说明关于y的一元二
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8分A.R.RahmanoneofIndia'smostwell﹣lovedmusiccomposerswoninternationalrecognitionwithtwoGrammyawards.LastyearhewontheOscarforhismusicinthehitfilmSlumdogMillionaire.ThisyearhehadhisfirstGrammywin.HepickeduptwoawardsonefortheBestCompilationSoundtrackforaMotionPictureSlumdogMillionaireandtheotherforBestMotionPictureSongforthesongJaiHofromthesamefilm.InthebestsongcategoryRahmanbeatsingerBruceSpringsteenandhissongTheWrestlerfromthemovieofthesamename.ThemodestRahmansaidThisismadGodisgreatagain. A.R.RahmanisacomposermusicProducermusicianandsinger.Hismusicscores乐谱andfilmsongssongschangedthecharacterofpopularmusicinIndiaintheearlyl990s.Rahman'smusiccompletelydissolvedthedividebetweenIndianandWesterncategories.Hepopularizedclassicalaswellasexperimentalmusic.Rahmanalsodiscoveredmanyyoungmusiciansanssingers. InterestinglytwootherIndianartistes艺人werenominatedforGrammysthisyear.UstadAmjadAliKhanIndia'smostwell﹣knownsarod萨罗达琴playerwasnominatedintheBestTraditionalWorldMusicAlbumcategoryforhisalbumAncientSounds.ZakirHussainthefamousTablamaestrowasnominatedintheBestClassicalCrossoverAlbumcategoryforhisalbumTheMelodyofRhythm.ZakirHusainwonaGrammylastyear.TheotherIndianswhohavewonGrammysinthepastarePanditRaviShankarVikkuVinayakramandVishvamohanBhatt. TheGrammyAwardscameintobeingin1958.ThesemusicawardsarepresentedeveryyearbytheNationalAcademyofRecordingArtsandSciencesoftheUSA.TheywereoriginallynamedtheGramophoneAwardsforthegramophone留声机wasthefirstinventionthatcouldrecordandreplaysoundanditwaswidelyusedthroughmostofthetwentiethcentury. 25.HowmanyfilmshasRahman'sprize﹣winningmusicbeenwrittenforsincelastyear? A.One. B.Two. C.Three. D.Four. 26.Whohasn'treceivedaGrammyawardinthepast? A.UstadAmjadAliKhan. B.PanditRaviShankar. C.ZakirHusain. D.VikkuVinayakram. 27.WhywastheGrammyAwardsonceregardedasGramophoneAwards? A.BecausethegramophonewasinventedintheUSAin1958. B.Becausethegramophonewasusefulanditsrangeofinfluencewaswide. C.Becausethegramophonehaslastedlongsinceitcameintobeing. D.BecausethegramophonewasfirstusedattheGrammyAwards. 28.Fromthispassagewecanlearn. A.Rahmanhasreceivedtwoawardssincelastyear B.Rahmanisacomposermusicproducermusicianandactor C.Rahmanusedtobemadbeforebeingfamous D.fiveIndianshavereceivedtheGrammyawards.
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下列说法正确的是
15分Communicationandtransportationnetworksbringpeopletogether.Yetsometimespeoplethemselvescreatebarriers.Insomecountrieslawsstoppeoplefrom61movefreelyfromplacetoplace. Inthepastmanygroupsofpeopleweredeniedthe62freetotravelbecauseoftheirracereligionornationality.CountriesalsosetupCustomspostsat63themborders.ForeigntravelershastogothroughaCustomsinspectionbeforethey64allowtotravelinthecountry. Manyofthoseharriersalsoacted65barrierstocommunication.Whentwo66governmentdisagreedwitheachotheronimportantmatterstheyusuallywouldnotwanttheircitizenstoexchangenewsorideasfreely.Countriesoftentriedtokeepmilitaryor67industryinformationsecret. Todaypeoplehavetheabilitytotraveltocommunicateandtotransportgoodsmorequicklyandeasily68everbefore.Naturalbarriers69usedtobedifficultordangeroustocrossahundredyearsagocannowbecrossedeasily.Thebarriers70makebypeoplearenorsoeasytoovercomebutinspiteofallkindsofbarrierspeoplecontinuetoenjoytravelingandtheexchangeofgoodsandideas.
8分WASHINGTON﹣Thousandsofpublicschoolsstoppedteachingforeignlanguagesinthelastdecadeaccordingtoasurvey.ButanothercontrarytrendhaseducatorsandpolicymakersabuzzarushbyschoolsinallpartsofAmericatoofferinstructionsinChinese. SomeschoolsarepayingforChineseclassesontheirownbuthundredsaregettingsomehelp.TheChinesegovernmentissendingteachersfromChinatoschoolsallovertheworld﹣andpayingpartoftheirsalaries. Noonekeepsanexactcountbutroughcalculationsbasedonthegovernment'ssurveysuggestthatperhaps1600AmericanpublicandprivateschoolsareteachingChineseupfrom300orsoadecadeago.Andthenumberisgrowingexponentially成倍地. It'sreallychangingthelanguageeducationlandscapeofthiscountrysaidNancyC.Rhodesdirectoratthecenter.Otherindicatorspointtothesametrend.ThenumberofstudentstakingtheAdvancedPlacementtestinChineseintroducedin2007hasgrownsofastthatitislikelytopassGermanthisyearasthethirdmost﹣testedA.P.languageafterSpanishandFrenchsaidTrevorPackervicepresidentattheCollegeBoard. We'veallbeensurprisedthatinsuchashorttimeChinesewouldgrowtosurpassA.P.GermanMr.Packersaid. AdecadeagomostoftheschoolswithChineseprogramswereontheEastandWestCoasts.ButinrecentyearsmanyschoolshavestartedChineseprogramsinheartlandstatesincludingOhioandIllinoisintheMidwestTexasandGeorgiaintheSouthandColoradoandUtahintheRockyMountainWest. Americahashadthestudyofaforeignlanguagegrowbeforeonlytoseethebubbleburst.ManyschoolsbeganteachingJapaneseinthe1980safterJapanemergedasaneconomicrival.Butthousandshavedroppedthelanguagethesurveyfound.Japaneseisnottheonlylanguagethathasdeclined.ThousandsofschoolsthatofferedFrenchGermanorRussianhavestoppedteachingthoselanguagestoothesurveyfound. 25.What'sthemeaningoftheunderlinedwordabuzzinthefirstparagraph? A.Benoisylikethesoundofabee. B.Belivelyforvariousactivities. C.Causepeopletodiscusssomethinghotly. D.Motivatepeopletomarchbravely. 26.WhatcanweinferfromwhatMr.Packersaid? A.MoreandmorepeoplechooseChineseinA.P.test. B.A.P.testisthemostdifficultoneintheworld. C.ChineseismoreimportantthanSpanishandFrench. D.Chineseisanecessarysubjectinmostimportanttests. 27.Whatcanweknowfromthelasttwoparagraphs? A.ManyschoolsstartedChineseprogramsintheMidwesttenyearsago. B.ChineseprogramshavebeenstartedinmoreareasinAmericarecently. C.AmericanschoolshavestoppedteachingFrenchGermanandRussian. D.PeoplearegraduallyfondoflearningChineseandJapaneseinrecentyears. 28.Whatisthemainideaofthepassage? A.ChineseisbeinglearnedasanofficiallanguageinAmerica. B.ForeignLanguagesfadeinAmericanschoolsexceptChinese. C.TeachingChineseinforeigncountrieshasbecomeatrend. D.ForeignlanguagesarenolongerbeingtaughtinAmerica.
10分假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下短文.短文中共有10处错误每句中最多有两处.错误涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号∧并在此符号下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下划一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. Iwanttotellyouanimpressivestoryhappeningduringmyfirstlesson.Onhearingthebellthestudentsranintotheclassroomasquicklyastheycan.ButaboyLiMingwhichfatherhaddiedamonthearlierwaslatefortheclass.Hequietstoodoutsidetheclassroom.Ismiledtohimandlethimcomein.Afterawhilehecriedonhisdesk.ThenIwalkedtoherandaskedwhathadhappened.Hetoldmethathismotherwasillandthathehastobuysomemedicineforher.Atthesametimeheapologizedmeforhislateness.MovingbyhiswordsIpraisedhimforhisdeedsanddecidedtosingasongnamedMotherforthestudents.Howtimeflied!ClasswasoverwhenIrealizedit.FromthestoryIfeltweshouldshowarespectforourparentanddoourbesttohelpthem.
1分﹣﹣Ithinkthepaperistakingyoualongtimetowrite. ﹣﹣Ionitforalmostamonthnow. A.worked B.wasworking C.amworking D.havebeenworking
某同学学习传感器后用电源电磁继电器滑动变阻器开关导线等仪器设计了一个高温报警器要求是正常情况绿灯亮有险情时电铃报警．电路如图所示图中仪器还不完整请完成以下问题 1图中的甲还需要放入的元件是 A．二极管 B．光敏电阻 C．NTC热敏电阻阻值随温度升高而减小 D．PTC热敏电阻阻值随温度升高而增大 2电路正确连接之后该同学调试过程发现报警时温度比预期偏高了一点点．要求在温度更低一点时就开始报警则需要调节滑动变阻器的滑动头往填“左”或“右”移动一点．
下列四幅图中能正确反映分子间作用力f和分子势能EP随分子间距离r变化关系的图线是
10分Doyouknowhowtowriteagoodadvertisement?36 ●Theystressabenefit.ThemainsellingplanisnotcleverlyhiddenbutismadeimmediatelyclearforexampleHowtowinfriendsandinfluencepeople. ●Theymakepeoplecuriousabouttheadandinvitesreadership.ThekeyhereisnottobeoffensivebuttofocusonthestrongestinterestsandconcernsofyourtargetaudienceforexampleDoyoumakethesemistakesinEnglishappealstothereader'sdesiretoavoidembarrassmentandwriteandspeakproperly. ●37TheheadlineHowtoimproveyourtestscoreswhenyousleepattractsthereadersbecauseitpromisesusefulinformation.Anadthatprovidesinformationforreaderswillgethigherreadershipandbetterresponse. ●Theyareknowledgeable.38Ahelpfulwayistotellthereadersomethinghealreadyknowsprovingthatyoutheadvertiserarefamiliarwithhisindustryapplicationorrequirement. ●Theymakeastrongoffer.39Alladsshouldhaveanofferbecausetheoffercreatesimmediateresponsefrompeoplewhoarereadytobuynoworatleastthinkingaboutbuying.40 A.Theyprovideinformation. B.Letmetellyousomethingaboutthis. C.Theyneversellproductsthatarepoorinquality. D.Herearesomecharacteristicsofsuccessfulprintads. E.Withoutanofferthesepeoplearenotencouragedtoreachyou. F.Theyreflectahighlevelofknowledgeandunderstandingoftheproduct. G.Goodadstellthereaderswhattodonextandencouragethemtotakeitnow.
如图所示在匀强磁场中匀速转动的单匝矩形线圈的周期为T转轴O1O2垂直于磁场方向线圈电阻为2Ω．从线圈平面与磁场方向平行时开始计时线圈转过60°时的感应电流为1A．那么
某同学做“用油膜法估测分子的大小”的实验． ①每滴油酸酒精溶液的体积为V0将该溶液滴一滴到水面上稳定后形成油膜的面积为S．已知500mL油酸酒精溶液中含有纯油酸1mL则油酸分子直径大小的表达式为d＝． ②该同学做完实验后发现自己所测的分子直径d明显偏大．出现这种情况的原因可能是． A．将滴入的油酸酒精溶液体积作为油酸体积进行计算 B．油酸酒精溶液长时间放置酒精挥发使溶液的浓度发生了变化 C．水面上痱子粉撒得太多油膜没有充分展开 D．计算油膜面积时将不完整的方格作为完整方格处理．
10分假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下短文.短文中共有10处错误每句中最多有两处.错误涉及一个单词的增加删除或修改. 增加在缺词处加一个漏字符号∧并在此符号下面写出该加的词. 删除把多余的词用斜线\划掉. 修改在错的词下划一横线并在该词下面写出修改后的词. 注意1.每处错误及其修改均仅限一词 2.只允许修改10处多者从第11处起不计分. ImadeabigmistakeinthechemicallessonlastFriday.Whenwewereinthelabmyheadwasstillfilledwiththeinformationsofafootballmatch.Sawtheothersbeginningtheexperiment.Ijustcopiedthemwithoutconsideringthattheteacherhadsaid.Allofthesuddenthematerialinthecuponmydeskwascaughtfire.Iwasshockedanddidn'tknowwhattodo.Unluckilymyteacherhelpedmeputoutthefireonsandquickly.Ifeelveryashamed.NotuntilthenIrealizethatcarelessnesswasharmfulinscience.
30分LiJia14amiddleschoolgirlinMeishansouthwestChina'sSichuanProvincehasbeentryingtoputonweight.Shehopestosavehermotherwhois41withleukemia白血病.Sofarshehas42around10kilogramsinhalfayearandhopesthatitwillbeenoughto43hertodonatebonemarrow骨髓toherparent. Thedoctoraskedhermothertohavebonemarrowtransplantationin2015asherconditionbecame44daybyday.ThinkingthatLiJiamaybea45marrowdonorforhermotherthedoctorsuggestedthatthegirlgainsomeweightsince46weightsbetweenthedonorandthereceiverwillhelpgeneratebetterresultsforboth. Thegirldecidedtohavehigh﹣caloriefoodsthatarenormally47byboysandgirlsofherage.Friedpotatoesporkandvarioussnackswereall48servedinherdailydiet. Aftermonthsofeffortsthegirl49hergoalofincreasingto60kilograms.Whilemanyofherbeautifuldresseshavebecometoo50shesaidTheseclotheswillfitagainoneday.Butifmomcan'tbe51nobodywillbetheretoseemegrowingup. PuttingawayherbelovedclothingsheboughtherselfloosejeansandT﹣shirtswhichshethoughtwould52herfat. Butshehasbeenteasedbysomeofherclassmatesunawareofthe53.Toallthequestionsabouthowshehadgainedsomuchweightinsuchashortperiodshesimplyrepliedwitha54andthendroppedherhead. ThisMaythe55finallycameout.Shecandonateherbonemarrowtothefamilymember. 56asshewasthemother57overthedonationafterlearningaboutthesufferingand58itcouldbringtohergirl59LiJiarefusedtochangehermind. I'mnotafraidofallthese.TheonlythingI60isthatIwillJoseyousheclaimed. 41.A.diagnosing B.struggling C.developing D.suffering 42.A.reduced B.lost C.gained D.wasted 43.A.allow B.tell C.force D.persuade 44.A.less B.worse C.lighter D.better 45.A.potential B.rare C.generous D.brave 46.A.different B.extra C.similar D.heavy 47.A.refused B.produced C.designed D.donated 48.A.narrowly B.occasionally C.hardly D.regularly 49.A.realized B.recognized C.referred D.planned 50.A.loose B.old C.tight D.priceless 51.A.welcomed B.treated C.cured D.comforted 52.A.display B.show C.avoid D.cover 53.A.situation B.condition C.environment D.trend 54.A.hug B.smile C.shout D.laugh 55.A.causes B.projects C.results D.bills 56.A.Happy B.Curious C.Afraid D.Weak 57.A.argued B.turned C.cancelled D.hesitated 58.A.joy B.harm C.benefit D.crisis 59.A.unless B.so C.but D.as 60.A.know B.insist C.miss D.fear
如图所示一个半径为R的透明球体放置在水平面上一束蓝光从A点沿水平方向射入球体后经B点射出最后射到水平面上的C点．已知OA＝R该球体对蓝光的折射率为．则 ①它从球面射出时的出射角β为多少 ②若光在真空中的传播速度为c那么请推导出光从A点传播到C点所需时间t的表达式用cR表示
25分假定你是李华Tom是你的美国好友他三年前来过你所在的城市.最近他写信询问你所在城市的变化.请你根据以下要点给他写一封回信. 要点1.谢谢他的来信 2.列举城市的一些变化 3.欢迎他再次来玩. 注意1.词数100左右 2.可以适当增加细节以使行文连贯. .
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＝0必有实数根 方程x2＋x＋1＝0的两个实数根之积为－1 以－1、2两数为根的一元二次方程可记为x2＋x－2＝0 一元二次方程2x2＋4x＋3m＝0的两实数根的平方和为7，则m＝－1
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